Reproduction by contact of films with refracting microscopic elements



R. BERTHON 1,930,550 REPRODUCTION BY CONTACT 0F F ILMS WITH REFRACTINGMICROSCOPIC ELEMENTS Filed Jan. 5. 19:1

W MENTOR BY WM (1 ATTORN Y5 Patented i r v i ;um-r 1 s PATENT oFrice, I a v e a H a ssi s m trssassssaws .Rodolp e Berthon, Neullly-lur-Selne, "France,

assignor to Kislyn Corporation, a corporation ofDelaware, Application January 5, 1931, Serlal'No. 506,7, and in'France January I, 1930 w t 4 Claims. (CI. 95-75) This invention relates to a novel and improved described in the aforementioned patent specimanner of eliminating the moire. effect'in the fication. copying of images from oneiilm-to another when The embossed auxiliary film, deprived of its the films are of the form referred toffor examemulsion, may be of the same length as the 5 ple, inU; S. Patent 1,807,822. Fhe'invention'has film. which is to be'rproduced, or it may be C0 particular use when employed with. an 'appashort and form a loop passing continuously, dur-' ratus such asshown in that patent, although 1 ing printing, through the u'nwiding apparatus do not intend to limit myselispeciflcally to that of the printing machine, or finally'it may be of apparatus. Y I the size of a single image and may be simply Among ther things, when printing i'romone stuck on the window of the printing machine. :5 lenticular film onto another it is importa'ntthat No precise relationship is necessary between the the network of lines printed in the sensitive ,various films. layer during the luminous impression through In-the accompanying, drawing is shown one the'lenticular elements or embossing should not form of apparatus which may be used for the be destroyed at any point by the actual phopractice of the invention, this apparatusbeing 70. tographic operations 1 of development, reversal substantiallythe same as that illustrated in the and eventual intensification; In fact, the phoaforesaid patent. tographic network unprinted in the gelatine bro- The single figure of the drawing is a diagrammide layer of the film actsas a veritable guide matic cross-section taken transversely of the t to'the luminous pencil in the phenomenon of the planes occupied by the films. j 75 efiacement of the moirs or watering. In all In the-drawing, the numeral 1 designates the the points in which this network is destroyed original film and the numeral 2 the copy film by the photographic operations, reproduction upon which is tobe reproduced the image on the takes place as if an embossed film deprived of original film. Each ofthe films 1 and 2 is proall photographic image had been superimposed vided on its face with a multiplicity of minute 0 on an unexposed embossed film. It is evident lenticular elements Sand 4, these elements being that in this case, moirs would make their apshown greatly exaggerated in size and, as'is well pearance because the light would have for its known in the art, being on the order of 500 or source a more or less difiuse surface without '100 to the inch. The films are shown as in conany guiding produced by lines printed in the tact with each other and the faces carrying the 5 gelatine layer of the original. lenticular elements are placed adjacent each The object of the present invention is to proother, as indicated, the emulsions 5 and 6 being vide an improvement in the method forming the placed on the opposite sides of the respective subject-matter oi the aforementioned patent, films. v

and permitting reproduction to be efiected even The numeral 7 denotes a source of light of f a film, the photograph network which any suitable character, the light from which has been partly destroyed by the photographic strikes a mirror 8, so disposed as to deflect to. operations. This method is based on the reconbeam of light through the films 1 and 2, the

. stituti n. duri h operation of p o ction, axis of this beam being designated 9. A suit- 40 01 a network of luminous lines in the plane of abl l y t m, indicat d dia rgnunatically at the layer of iatin of th ori in l fi m which is 10, may be used and also a suitable shutter ll. to be reproduced- F this P p it ufl o The mirror 8 may be continuously oscillated in interpose between the source of light and the the manner described in the aforesaid patent ri in l wh is to e p d d. d u t nby means of a' cam follower 12 secured to the 45 tially in contact with the latter an embossed mm mirror and adapted to rock it on its pivot 13 d p iv of i K in and havingits embossed under the action of a cam 14 secured on the face turned towards the sourceof light. The shutter shaft 15. embossin on t is u i i ry fi will thus pro- Disposed between the source of light, or in this duce in the plane of the photographic ima e of case between the mirror 8 and the original film,

60 the film to be reproduced, a veritable network is the auxiliary film referred to above and which or grating of luminous lines formed by the is indicated at 16. This film has lenticular eleimages of the source through the embossing, the merits 1'1 shown as disposed towards the source said network of luminous lines sweeping the enof light and forms a substantially transparent tire surface of th original photographed; print element between the source of light and the 55 during the oscillat on of the luminous pehcilas films. As pointed out above, this element may conveniently be made or a film having lenticulations thereon and from which the emulsion has been removed, although, of course, other forms of elements may be used where found convenient.

The element 16 is preferably disposed closely adjacent the emulsion of the film 1 so as to be in substantially the same plane as that emulsion. The lenticular elements are usually in the form of cylindrical lens elements extending lengthwise 01' the film, and the result will be that the lenticular elements 17 will form a grating upon the emulsion 5 to take the place 01' any parts 01' the grating which may have been destroyed by the photographic operations. That is to say, it is well known that in the use 01' a film of the type shown herein, the film, as a result or the photographic operations which result in the formation of an image thereon, has a grating of different lines forming the diflerent color values; for example, red, green, and blue. These lines, however, are apt to be partly destroyed or reduced to such a size as to be practically non-existent, in places.

By the use of the auxiliary film or other element 16, the light passing to the original film l is acted upon by the multiplicity of lenticular elements 1'7 and caused to form a grating which will supply the partial lack of such a grating on the original film. This grating, formed by the elements 17, will sweep across the original film as stated above, and in this way aid in eliminating the moir eilect.

Of course, it is to be understood that the words "grating and "network" are to be used interchangeably, the question or whether or not a. grating or network occurs, depending upon the form and arrangement of the lenticular elements used on the films.

While I have shown the invention as embodied I in a certain form and practiced in a certain manner, it is to be understood that various changes may be made without departing from the spirit or scope of the invention, and I therefore do not intend to limit myseli' except by the appended claims.

I claim:

1. In combination, an original film and a copy film, each of said films having a multiplicity of lenticular elements on one side thereof and the films being placed substantially in contact with said elements adjacent each'other, a source of light so placed as to pass a beam of light first through the original film and then through the copy film, and a substantially transparent element disposed between said source of light and the original film and having thereon a multiplicity of lenticular elements.

2. In combination, an original film and a copy film, each 01 said films having a multiplicity of lenticular elements on one side thereoi and the films being placed substantially in contact with said elements adjacent each other, a source oi light so placed as to pass a beam of light first through the original film and then through the copy film, a substantially transparent element disposed between said source of light and the original film and having thereon a multiplicity of lenticular elements, and means for moving said beam of light transversely of said films.

3. The method of printing from an original film on to a copy film, each of which has thereon a multiplicity of. fine lenticular elements, which comprises restoring a partiallydestroyed grating or network on the original film by passing a beam of light through a transparent element which will form a complete grating or network corresponding to that which has been partially destroyed, and then passing said beam of light through said original film and copy film in succession.

,4. The method-oi printing from an original film on to a copy film, each of which hasthereon a multiplicity of fine lenticular elements, which comprises restoring'a partially destroyed grating or network on the original film by passing a beam of light through a transparent element which will form a complete grating or network corresponding to that which has been partially destroyed, and then passing said beam 01 light through said original film and copy film in succession while continually moving said beam of light transversely to said films.

RODOLPHE BERTHON. 

